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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@woolif
have tried various different cateye ones - most use a knob thing to tighten onto seatposts. am curently happy w/a smart led light but it uses a bracket (but can also clip to bags etc) has anyone recommended the non-friction dynamo ones that run on magnets yet?